Distinguishes mixtures from substances

1. Crude oil is a raw material that is very significant in the petroleum industry. How will you classify crude oil as a material?

• mixture

• compound

• substance

• element

Ana and Gracia love to eat ginataang bilo-bilo, a nutritious Pinoy delicacy filled with glutinous balls (bilo-bilo), banana, sago pearl, sweet potato, cassava, coconut milk, sugar, and many others. Which of the following would BEST describe this kind of appetizing snack?

• It is a homogeneous mixture since all ingredients are completely mixed.

• It is either homogeneous or heterogeneous since some ingredients are well mixed.

• It is a heterogeneous mixture for you will be able to identify its component

• It is neither homogeneous nor heterogeneous since there are portions that were not mixed.

A container of an unknown liquid is subjected to heat. The liquid component vaporized and a solid residue appeared in the container. How do you classify the liquid material?

• substance

• compound

• element

• mixture

Which of the following properties will help you to determine an unknown sample as mixtures or substances?

• color and shape

• volume and mass

• boiling and melting point

• magnetic property and taste

Two unknown solid samples were given as illustrated on the set up above. Which of the following statement is CORRECT to identify the components of the samples as substance or mixture?

• The samples were heated; one sample is expected to vaporize.

• The samples were heated and one sample is expected to melt.

• The materials were heated; one sample turned into a gas and condensed while the other one remains the same.

• The materials were heated; one sample will release a gas while the other one produced a solid crystal.

True or False:

Elements and compounds are pure substances.

• True

• False

Which of the following common properties is NOT used for identifying an unknown material as mixtures or substances?

• Density

• Solubility

• Heating Properties

• Electric and Magnetic Properties

• None of the given choices

Caesar Salad is an example of ________________.

• Homogenous Mixture

• Heterogenous Mixture

• Pure Substance

• Compound

Which of the following statements is NOT TRUE?

• A pure substance has no other substance mixed in it.

• Distilled water, steel, salt and air are all examples of pure and impure substances.

• Melting will take place at a lower temperature in an impure substance than the pure substance.

• Pure substance can be separated by physical means such as filtration, evaporation, distillation and chromatography.

Fill in the blank:

________________ are made of materials that are not chemically combined. They are also called impure substances for they contain substances with other materials mixed with them.